it scratches?While I love garnet sand and run a hefty 70kg or so in my 1,000g; all of my smaller tanks are barebottom. Since all my tanks minus one are acrylic, I've learned the detriment of stingrays + sand + acrylic all too familiarly. If you're using glass, I'd go with shallow sand bed if you want to see the rays acting like they would in nature in sand. If you don't care about such enrichment, barebottom is infinitely easier.
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When stingrays drag it up and down acrylic it marks it pretty badly, yes.it scratches?